You need to check for immo malfunction codes , you may have a bad keyfob that has a short in it
and now getting worst .try your spare if you have one .
But doing a diagnostic scan will show up what ever the problem is if its internal .
Note : it is known for these keyfobs to fail inside and this could be your problem ,
Need any follow up help then please get back to me with the reply button, and not the poor or bad service.
This way i can get back to you or suggest another expert if needed.
If i do not get back to you then i may be off line, and when i get back online i will get back to you..
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Kind regards Greg.